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Weather on September 16 at Gateway Arch

Gateway Arch National Park

MOMidwest450 ft elevation
Avg High81°F
Avg Low58°F
Warmest202684°F
Coldest201155°F

Based on 53 years of data from St. Louis, MO

Planning Your Visit

September 16th in Gateway Arch National Park (via St. Louis, MO) typically brings warm fall weather, with average highs around 81°F and lows near 58°F. Over 53 years of records, the warmest September 16th was in 2026 (84°F average), while the coldest was 2011 (55°F) — a 29°F range across recorded history. Rain or other precipitation has occurred on about 32% of September 16th dates historically, with the wettest September 16th recording 1.66" of rain. The last decade has been 7.7°F warmer on this date compared to 20-30 years ago.

The last decade has been 7.7°F warmer on this date compared to 20-30 years ago.

Planning for September 16th in Gateway Arch? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.

Year by Year History

YearHighLowPrecipSnow
202695°F73°F0.2"--
202593°F63°F0"--
202488°F63°F0"0"
202380°F53°F0"0"
202286°F56°F0"0"
202185°F54°F0"0"
202082°F51°F0"0"
201995°F67°F0"0"
201892°F65°F0"0"
201791°F--0"0"
201691°F69°F1.66"0"
201583°F61°F0"0"
201478°F57°F0.02"0"
201384°F60°F0.05"0"
201270°F56°F0"0"
201163°F47°F0"--
201083°F63°F0.09"0"
200978°F62°F0.02"0"
200864°F55°F0"0"
200764°F49°F0"0"
200681°F51°F0"0"
200575°F59°F0.49"0"
200484°F70°F0.13"0"
200381°F56°F0"0"
200279°F64°F0"0"
200176°F51°F0"0"
200071°F44°F0"0"
199976°F51°F0"0"
199879°F68°F0.56"0"
199787°F65°F0"0"
199660°F54°F0.85"0"
199583°F64°F0.6"0"
199487°F64°F0"0"
199365°F54°F0"0"
199286°F64°F0"0"
199192°F58°F0.25"0"
199079°F50°F0"0"
198975°F52°F0"0"
198892°F67°F0"0"
198787°F59°F0"0"
198678°F58°F0"0"
198580°F51°F0"0"
198178°F57°F0"0"
198082°F62°F0"0"
1979--45°F0"0"
197887°F53°F0.83"0"
197769°F60°F0.63"0"
197686°F56°F0.01"0"
197570°F54°F0"0"
197473°F57°F0.02"0"
197382°F51°F0"0"
197291°F66°F0"0"
197181°F--0.39"0"

September 16 at Nearby Parks

Holiday Weather at Gateway Arch

Official NPS WebsiteVisit nps.gov/jeff for park information, alerts, and reservations

Explore More at Gateway Arch

See historical weather for other dates

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